<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <input type="text" v-model.number="num1">
        <span>+</span>
        <input type="text" v-model.number="num2">
        <span>=</span>
        <span>{{ num1 + num2 }}</span>

        <div>
            <!-- 修饰符也可以连用，没有顺序之分 -->
            <input type="text" v-model.trim.lazy="msg">
            <p>{{msg}}</p>
        </div>
    </div>

    <script src="./vue.js"></script>
    <script>
        new Vue({
            el: '#app',
            data: {
                num1: 0,
                num2: 0,
                msg: ''
            }
        })
    </script>
</body>
</html>